/**
 * Copyright (C) 2002-2015   The FreeCol Team
 * <p>
 * This file is part of FreeCol.
 * <p>
 * FreeCol is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * <p>
 * FreeCol is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with FreeCol.  If not, see <http://www.gnu.org/licenses/>.
 */


package net.sf.freecol.common.model;


/**
 * Interface for retriving information about
 * a the creation/deletion of {@link FreeColGameObject}s.
 */
public interface FreeColGameObjectListener
{

    /**
     * Notify a listener (if any) of a new object.
     *
     * @param id The object identifier.
     * @param fcgo The new <code>FreeColGameObject</code>.
     */
    public void setFreeColGameObject( String id, FreeColGameObject fcgo );

    /**
     * Notify a listener (if any) of that an object has gone.
     *
     * @param id The object identifier.
     */
    public void removeFreeColGameObject( String id );

    /**
     * Notify a listener (if any) of that an object has changed owner.
     *
     * @param source The <code>FreeColGameObject</code> that changed owner.
     * @param oldOwner The old owning <code>Player</code>.
     * @param newOwner The new owning <code>Player</code>.
     */
    public void ownerChanged( FreeColGameObject source,
                              Player oldOwner, Player newOwner );
}
